I had my first lemon crumble muffin at this play centre we take the kids to. I loved the different textures, the soft almost marshmallow like muffin, topped with crunchy, crumble pieces and hinted throughout with lemon.. mmm! My father in law and husband demolished the whole lot of these with ease, and that speaks volumes.

Preheat oven to 180°c. Line a muffin pan with 12 paper liners. To prepare crumb topping: In a bowl, mix together dry ingredients. . Slowly add melted butter. Use a fork to blend together until only small pieces remain. Set aside. In a stand mixer, cream together butter and granulated sugar until light and fluffy. Add egg, mixing until fully combined, followed by vanilla, lemon zest and lemon juice. Continue mixing, add salt, baking powder and flour, mixing until fully combined. Divide batter between prepared baking cups. Generously coat each portion of batter with prepared crumb topping.Bake for 20-25 minutes. Cool in pan for 5-10 minutes or until easy to handle. Transfer to a wire rack to cool completely. When muffins are cool, prepare glaze. In a small bowl, mix together icing sugar and lemon juice. Use a small spoon to drizzle glaze over cooled muffins.